1973 Corfu UK Holiday flight - I reckoned first a BAC 1-11
so could be Laker Dan Air or Cambrian at the time.
(Not a -500 series as they had a tip kink added)
But I am thinking it is a Comet (DA or KT) - do I see a glimpse of the fuel jettison?
Doubt a 727 (DA) before the LE slats/flaps go down, but curved windows>? No.
Which it also means it is not a 707 (GK KT DA) or a 737-200 (BY)
and not a Viscount.